An online resource from the American Heart Association can help reinforce the teaching you’ve done in your office about anticoagulation. “A Patient’s Guide to Warfarin,” which is available at http://www.heart.org/HEARTORG/Conditions/Arrhythmia/PreventionTreatmentofArrhythmia/A-Patients-Guide-to-Taking-Warfarin_UCM_444996_Article.jsp, describes how the anticoagulant works, drugs that interact with it, adverse effects to watch for, and the importance of wearing a medical alert bracelet. It also offers an easy-to-understand explanation of several anticoagulation concepts, such as prothrombin time and the International Normalized Ratio, and provides a list of patient do’s and don’ts.